SR20DEs are not AWD. they are either FWD or RWD.
SR20DETs, on the other hand, come in either RWD or AWD form from the factory.
why? you know what? i haven't the slightest. i don't know everything. all i know is that there is no factory FWD SR20DET. it's not hard to find answers. there are A LOT of boards that are solely dedicated to G20, SE-R, NX, etc. owners. go ask them.
www.sr20deforum.com
www.g20.net
www.se-r.net